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Goodwill and Intangible Assets - Schedule of Goodwill by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 26, 2024
Jun. 28, 2023
Jun. 26, 2024
Jun. 28, 2023
Goodwill [Roll Forward]        
Balance, beginning of year     $ 65,908  
Reclassifications from Keke's assets held for sale     469  
Impairment charges related to Denny's assets held for sale $ (20) $ 0 (20) $ 0
Balance, end of period 66,357   66,357  
Total goodwill 66,357   66,357  
Denny’s        
Goodwill [Roll Forward]        
Balance, beginning of year     37,527  
Balance, end of period 37,507   37,507  
Total goodwill 37,507   37,507  
Other        
Goodwill [Roll Forward]        
Balance, beginning of year     28,381  
Balance, end of period 28,850   28,850  
Total goodwill $ 28,850   $ 28,850